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(a) Output piezoelectric voltage of accuracy experiment. (b) Output piezoelectric voltage response of accuracy experiment. (c) Optical image of the sensor is attached on the popliteal fossa. (d) Output piezoelectric voltage of popliteal fossa of sensor as the tester is walking, running, and jumping. (e) Optical image of the sensor is attached on the adam’s apple. (f) The different signals output by the sensor when tester says different words.
